CVE-2025-27821
January 26, 2026
Out-of-bounds Write vulnerability in Apache Hadoop HDFS native client.
This issue affects Apache Hadoop: from 3.2.0 before 3.4.2.
Users are recommended to upgrade to version 3.4.2, which fixes the issue.
Affected Packages
https://github.com/apache/hadoop.git (GITHUB):
Affected version(s) >=rel/release-3.2.0 <rel/release-3.4.2Fix Suggestion:
Update to version rel/release-3.4.2org.apache.hadoop:hadoop-hdfs-native-client (JAVA):
Affected version(s) >=3.2.0 <3.4.2Fix Suggestion:
Update to version 3.4.2Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Out-of-bounds Write
EPSS
Base Score:
0.11
